Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91445f159d8e6af…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 18:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a53891f8a1d1ca4d00e565cca24463fd SHA-1: 239adf1fc4d5809575b350b867edaa74be77d245 SHA-256: a91445f159d8e6afaa957fe118444c9c9baa9c6e053c1ae622f303ee06a4d88e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming scheme. The document body is heavily obfuscated, but the overall structure and heuristic firings indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/uplcv?utm_term=piano+tiles+lagu+indonesia+mod+apk PDF link annotation
    • http://7m-shop.com/userfiles/file/mokejanenezibateguf.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/10761178272.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/3905379273.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/kogabanedozigoji.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/vagina.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/22738965386.pdfIn PDF document text
    • http://tochuchoinghi.org/files/xakibilakewiripe.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/99788194212.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/vukafujoliw.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/pefegisimemuwozarede.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3841e115e---fimalifis.pdfIn PDF document text
    • http://immopolignano.lu/images/94874742169.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/nukaparizabofebeteve.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/mesor.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210906_74C5E33DF7C696DD.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/25563242138.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/14002247678.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/97051667962.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/29881624612.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a31e7a2917f6b09b1a0a26186d244c6d/30494707003.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/76915310822.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/5534004961.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/pefod.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/27289988902.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/19765775030.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 19080 bytes
SHA-256: dbb97e188b65174859214fa038faeb96ee1e6bc0e660e4a82b74eda1b7155b4a
font_01_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F47 10828 bytes
SHA-256: 642a02cd99e630ef520d0decbcb94f9ac399fe8854991abbffc8a454cc84f4bc

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